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https://issues.apache.org/jira/browse/QPID-3216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021639#comment-13021639
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Rajith Attapattu commented on QPID-3216:
----------------------------------------
I have a suspicion that my following commit may have triggered this deadlock.
http://svn.apache.org/viewvc?view=revision&revision=1092510
I am yet to confirm this, but wanted to share this in case anybody else is also
looking at it.
> Deadlock between "_lock" (in AMQSession#DisptcherThread) and
> "_messageDeliveryLock" (in AMQSession.java)
> --------------------------------------------------------------------------------------------------------
>
> Key: QPID-3216
> URL: https://issues.apache.org/jira/browse/QPID-3216
> Project: Qpid
> Issue Type: Bug
> Components: Java Client
> Affects Versions: 0.10
> Reporter: Rajith Attapattu
> Assignee: Rajith Attapattu
> Fix For: 0.11
>
>
> As per the following thread dump you can clearly see the deadlock between
> "_lock" (in AMQSession#DisptcherThread) and "_messageDeliveryLock" (in
> AMQSession.java)
> This is another regression and I am working to identify the rev that caused
> it and possibly understand the circumstances surrounding the change.
> dispatcher thread already obtained "_lock" in dispatchMessage method.
> dispatcher thread waiting to take "_messageDeliveryLock" in the same method.
> main thread has already obtained "_messageDeliveryLock" in AMQSession.close
> method.
> main thread waiting to take "_lock" in DispatcherThread.rejectPending method.
> Found one Java-level deadlock:
> =============================
> "Dispatcher-Channel-0":
> waiting to lock monitor 0x0000002ac1e6f0b8 (object 0x0000002a9f040448, a
> java.lang.Object),
> which is held by "main"
> "main":
> waiting to lock monitor 0x0000002ac1e6f010 (object 0x0000002a9f03ba40, a
> java.lang.Object),
> which is held by "Dispatcher-Channel-0"
> Java stack information for the threads listed above:
> ===================================================
> "Dispatcher-Channel-0":
> at
> org.apache.qpid.client.AMQSession$Dispatcher.dispatchMessage(AMQSession.java:3315)
> - waiting to lock<0x0000002a9f040448> (a java.lang.Object)
> - locked<0x0000002a9f03ba40> (a java.lang.Object)
> at
> org.apache.qpid.client.AMQSession$Dispatcher.access$900(AMQSession.java:3096)
> at org.apache.qpid.client.AMQSession.dispatch(AMQSession.java:3089)
> at
> org.apache.qpid.client.message.UnprocessedMessage.dispatch(UnprocessedMessage.java:55)
> at org.apache.qpid.client.AMQSession$Dispatcher.run(AMQSession.java:3243)
> at java.lang.Thread.run(Thread.java:619)
> "main":
> at
> org.apache.qpid.client.AMQSession$Dispatcher.rejectPending(AMQSession.java:3122)
> - waiting to lock<0x0000002a9f03ba40> (a java.lang.Object)
> at
> org.apache.qpid.client.AMQSession.confirmConsumerCancelled(AMQSession.java:897)
> at
> org.apache.qpid.client.BasicMessageConsumer_0_10.sendCancel(BasicMessageConsumer_0_10.java:189)
> at
> org.apache.qpid.client.BasicMessageConsumer.close(BasicMessageConsumer.java:573)
> - locked<0x0000002a9ef30aa0> (a java.lang.Object)
> at org.apache.qpid.client.AMQSession.closeConsumers(AMQSession.java:2464)
> at
> org.apache.qpid.client.AMQSession.closeProducersAndConsumers(AMQSession.java:2514)
> at org.apache.qpid.client.AMQSession.close(AMQSession.java:731)
> - locked<0x0000002a9f040448> (a java.lang.Object)
> - locked<0x0000002a9ef30aa0> (a java.lang.Object)
> at org.apache.qpid.client.AMQSession.close(AMQSession.java:708)
> at
> org.apache.qpid.client.AMQConnection.closeAllSessions(AMQConnection.java:1003)
> at org.apache.qpid.client.AMQConnection.doClose(AMQConnection.java:897)
> - locked<0x0000002a9ef30aa0> (a java.lang.Object)
> - locked<0x0000002a9ef30ab0> (a java.lang.Object)
> at org.apache.qpid.client.AMQConnection.doClose(AMQConnection.java:886)
> - locked<0x0000002a9f040448> (a java.lang.Object)
> - locked<0x0000002a9ef30ab0> (a java.lang.Object)
> at org.apache.qpid.client.AMQConnection.close(AMQConnection.java:870)
> at org.apache.qpid.client.AMQConnection.close(AMQConnection.java:861)
> at org.apache.qpid.client.AMQConnection.close(AMQConnection.java:856)
> at
> org.apache.qpid.test.utils.QpidBrokerTestCase.tearDown(QpidBrokerTestCase.java:1118)
> at junit.framework.TestCase.runBare(TestCase.java:130)
> at
> org.apache.qpid.test.utils.QpidBrokerTestCase.runBare(QpidBrokerTestCase.java:234)
> at junit.framework.TestResult$1.protect(TestResult.java:106)
> at junit.framework.TestResult.runProtected(TestResult.java:124)
> at junit.framework.TestResult.run(TestResult.java:109)
> at junit.framework.TestCase.run(TestCase.java:118)
> at org.apache.qpid.test.utils.QpidTestCase.run(QpidTestCase.java:120)
> at junit.framework.TestSuite.runTest(TestSuite.java:208)
> at junit.framework.TestSuite.run(TestSuite.java:203)
> at
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:297)
> at
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:672)
> at
> org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:546)
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